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WACKE <br /> Safety Data Sheet <br /> Material : 60004600 HDK® N20 <br /> HYDROPHILIC PYROGENIC SILICA <br /> Version : 2. 1 (US) Date of print: 06/25/2015 Date of last alteration : 06/24/2015 <br /> 7. 1 Handling <br /> Precautions for safe handling: <br /> Avoid dust formation . <br /> Precautions against fire and explosion : <br /> Electrostatic discharge possible during transport and processing . Take precautionary measures against electrostatic charging . <br /> Ensure all parts of equipment are well earthed . Use inert gas when working with combustible and explosive liquids . Avoid dust <br /> deposit, remove dust regularly. <br /> 7.2 Storage <br /> Conditions for storage rooms and vessels : <br /> none known <br /> Advice for storage of incompatible materials : <br /> not applicable <br /> Further information for storage : <br /> Keep container dry and tightly closed . <br /> 8 . Exposure controls and personal protection <br /> 8. 1 Engineering controls <br /> Ventilation : <br /> Use only with adequate ventilation . <br /> Local exhaust: <br /> In case of dust formation : ( To maintain concentration below TLV. ) Local exhaust ventilation which meets the requirements of <br /> ANSI Z9. 2 is recommended to control airborne contaminants at the point of use . <br /> 8 . 2 Associate substances with specific control parameters such as limit values <br /> Maximum airborne concentrations at the workplace : <br /> CAS No. Material Type mg/m m Dust fract. <br /> 7631 -86-9 Silica , amor hous OSHA PEL 0. 8 <br /> Particulates not otherwise classified ACGIH TWA 10.0 Inhalable <br /> dust/mist <br /> Particulates not otherwise classified ACGIH TWA 3 . 0 Respirable <br /> ust/mist <br /> Re Silica , amorphous : The exposure limits given for CAS-No. 7631 -86-9 cover all types of synthetic amorphous silica ; it appears , <br /> that there is an error in the OSHA PEL entry for amorphous silica. There should have been a footnote to the Z-3 Table indicating <br /> that the percent SiO2 in formula (80 mg/m3 + % SiO2) refers to crystaline silica content and not to amorphous silica. For <br /> evaluation of U . S . exposure measurements WACKER recommends use of the current NIOSH REL (6 mg/m3) instead of the old <br /> Z-3 Table entry. <br /> Re Particulates not otherwise classified : The value is for particulate matter containing no asbestos and < 1 % crystalline silica <br /> (ACGIH) . <br /> 8.3 Personal protection equipment (PPE) <br /> Respiratory protection : <br /> In case of dust formation : A NIOSH approved particulate respirator with a P95 or higher rating . <br /> Hand protection : <br /> Recommendation : rubber gloves . <br /> Eye protection : <br /> Recommendation : Safety glasses with side shields or chemical safety goggles . <br /> Other protective clothing or equipment: <br /> Barrier cream may be used to prevent dryness of skin . <br /> 8 .4 General hygiene and protection measures : <br /> Do not breathe dust/vapor/mist/gas/aerosol . Wash thoroughly after handling . <br /> Page: 3/8 <br />